← View Generic P0603 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0603: Internal Control Module Keep Alive Memory Error

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$200 - $1500
Parts & Labor
Difficulty
5/5
2-4 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2020 Chevrolet
SILVERADO 1500 PICKUP
⚠️

Important for 2020 Chevrolet SILVERADO 1500 PICKUP Owners

Before starting repairs, verify which engine your 2020 Chevrolet SILVERADO 1500 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0603 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The engine control module has lost its keep alive memory, which stores learned parameters and adaptations.
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Symptoms

  • • Check engine light
  • • poor performance
  • • rough idle
  • • transmission shifting problems
  • • loss of learned parameters.
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Common Causes

  • • Weak battery
  • • power supply interruption to ECM
  • • faulty ECM
  • • poor battery connections
  • • alternator problems.
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How to Fix P0603 on 2020 Chevrolet SILVERADO 1500 PICKUP

Test battery and charging system, check ECM power and ground circuits, replace battery if weak, reprogram ECM.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

ECU/PCM Module Shop ↗ Wiring Harness Shop ↗ Connectors Shop ↗

Essential Tool

Must Have

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Related Diagnostic Codes

Other codes that may appear with P0603

P0601 Sequential Code

Internal Control Module Memory Check Sum Error

High
P0602 Sequential Code

Control Module Programming Error

High
P0604 Sequential Code

Internal Control Module Random Access Memory Error

High
P0605 Sequential Code

P0605: Engine Control Module (ECM) Output Circuit Malfunction

High

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system